But he said he found it difficult to perform because Porgy has a bad leg and cannot walk.

VOA: special.2010.03.07

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

耶鲁公开课 - 基础物理课程节选

And this is important because it means that since we cannot observe, we cannot talk about individual electrons.

这很重要,因为这意味着我们不能观察，不能谈及单个电子。

麻省理工公开课 - 固态化学导论课程节选

The new research shows that the buds on the side cannot export their auxin into the main stem because it is too full.

VOA: special.2009.10.13

We know very well, by the way, that there are scientists who simply cannot stand to read poetry because it's false, right?

我们清楚的知道，有些科学家,不能忍受诗歌因为他们认为诗歌是伪造的？

耶鲁公开课 - 文学理论导论课程节选

If your friend cannot stop talking about something because she thinks it is important, you might say she has a bee in her bonnet.

VOA: special.2009.06.28

You cannot have a spring pulled only at one side, because then it will then accelerate with infinite acceleration in that direction.

你不可能对弹簧只施加一边的拉力,因为那样的话弹簧就会以无穷大的加速度加速,就在这个方向上

耶鲁公开课 - 基础物理课程节选

Yet many people today cannot see the Maze District because it is so difficult to reach.

VOA: special.2009.04.15

Because it challenged the whole class system, that people are born into a certain place and cannot-- and should not-- be moved.

因为它挑战了整个阶级体系，人生来就有阶级，不能-,也不应该被改变。

哈佛公开课 - 幸福课课程节选

"We cannot say subsidies but we call it machinery restructuring, because as you know the machinery for the shoe is already 20-years-old."

VOA: standard.2010.05.13

That's unethical behavior because it -if you keep trading too much, then you cannot possibly make money.

这是不道德的行为,因为,如果你一直过度交易,那你基本不可能赚到钱

耶鲁公开课 - 金融市场课程节选

should Russia buy in the West because its own industry cannot do it, or should the country somehow try to manage on its own?

VOA: standard.2009.03.20

What do I learn from the period? How？ Remember, you cannot peek into Chapters 6 and 7, because you've seen it before.

我能利用周期得到什么结论,怎么做,记住,你不能跳到第六章和第七章,即使你看过了

耶鲁公开课 - 基础物理课程节选

"I am more than satisfied." "I cannot explain. It is more than I expected, because to meet the pope personally you have to be something special."

VOA: standard.2010.04.18

But the mathematicians told Dirac, "You cannot ignore the negative energy solution because it tells you there's a second solution and you cannot throw them out."

但数学家们告诉狄拉克,你不能忽略负的能量,因为数学告诉我有两个根,你不能随便丢掉

耶鲁公开课 - 基础物理课程节选

It cannot be priced at a level where only certain people have access, because then you are cutting entire sections of our country out of involvement in the world,"

VOA: standard.2010.01.05

I cannot even make it look hard because I have memorized this problem from childhood, so there is no way I can make this look difficult.

我不会让这些问题变得看起来复杂,因为这些问题我童年时就熟记于心,我无法让它变得复杂

耶鲁公开课 - 基础物理课程节选

"They have seen what happens when patients do not come in for regular check-ups or screenings because either their insurance company does not cover it, or they cannot afford insurance in the first place,".

VOA: standard.2009.10.05

There's only one occasion where it helps to go to three dimensions because there are certain things you can do in 3D you cannot do in less than 3D.

只有一种情况下进入三维是有意义的,因为有些事情你能在三维空间内完成,但低于三维就做不到了

耶鲁公开课 - 基础物理课程节选

And,this constant movement of population also affects the humanitarian workers as it makes the planning and the delivery of aid much more difficult because we cannot predict where the people are going or if they are coming back."

VOA: standard.2009.06.21

So you cannot use the formula once it hits the ground because once it hits the ground, the fundamental premise that a was a constant of -9.8 or -10 is wrong.

当物体落地以后,该公式就不适用了,因为当物体落地后,公式的基本前提——,加速度为常数-9.8或-10——就不成立了

耶鲁公开课 - 基础物理课程节选

"But,it puts us in a very awkward position because,if we cannot go there ourselves to see what they are doing, to whom they are distributing and what criteria they are using, how much they are keeping for themselves, how much is getting lost, we start losing control over it,"

VOA: standard.2009.08.07